I already owned sneakers just like Kazu's. ...and the whole costume was easy. I used yellow fabric paint to paint the cross on the shirt. It took several coats and quite a while to dry. ...and it ended up being really thick.

Personal Thoughts:

If you've seen Digimon Tamers, you'd know why I'd want to dress as Kazu. He's a snotty little kid with an attitude...and a lot of fun. That was all the inspiration I needed. Unfortunately, it's often not even recognized as a costume...except by true Digimon Tamers fans. Also, Kazu's like 12 or so. I'm obviously not.